Is false threatening bad?

I've been threatening players in pregame for the past few days by saying "dodge if u dun wanna lose lp". Sumhow this boosted my win rate. Please don't ban me, I'll stop if it's a big bad. I played properly and stuff, and my speech kept all my teammates on edge so they try their best. In their heads : I'm probably going to have to hard carry this stupid bronze feeder. I tried this on multiple accounts as well, same results. So is false threatening > being genuinely nice only to get flamed if u do bad?